Sempre que conectado ao meu dynadock, meu notebook (Linux Mint rodando o Ubuntu 14.04.1) travou inesperadamente com:
E se eu pressionar Ctrl + Alt + F8 :
[drm:intel_set_cpu_fifo_underrun_reporting [i915] *ERROR* uncleared fifo underrun on pipe B
[drm:intel_cpu_fifo_underrrun_irq_handler [i915] *ERROR* CPU pipe B FIFO underrun
Ocasiões especiais em que isso ocorre incluem:
após algumas horas de uso do meu notebook sem problemas aparentes. Algumas mensagens que podem ser úteis do syslog:
Feb 20 12:08:44 andyandy-net acpid: input device has been disconnected, fd 15
Feb 20 12:08:44 andyandy-net avahi-daemon[988]: Withdrawing workstation service for eth1.
Feb 20 12:08:44 andyandy-net NetworkManager[951]: SCPlugin-Ifupdown: devices removed (path: /sys/devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2.3/1-2.3:1.0/net/eth1, iface: eth1)
Feb 20 12:08:44 andyandy-net NetworkManager[951]: <info> (eth1): device state change: unavailable -> unmanaged (reason 'removed') [20 10 36]
Feb 20 12:08:44 andyandy-net NetworkManager[951]: <info> (eth1): cleaning up.
..
Feb 20 12:08:44 andyandy-net NetworkManager[951]: <warn> (4) failed to find interface name for index
Feb 20 12:08:44 andyandy-net NetworkManager[951]: (nm-system.c:766):nm_system_iface_get_flags: runtime check failed: (iface != NULL)
Feb 20 12:08:44 andyandy-net NetworkManager[951]: <error> [1455970124.693318] [nm-system.c:768] nm_system_iface_get_flags(): (unknown): failed to get interface link object
Feb 20 12:08:44 andyandy-net kernel: [ 3199.935878] usb 1-2.3: USB disconnect, device number 7
Feb 20 12:08:44 andyandy-net kernel: [ 3199.935965] asix 1-2.3:1.0 eth1: unregister 'asix' usb-0000:00:14.0-2.3, ASIX AX88772 USB 2.0 Ethernet
Feb 20 12:08:44 andyandy-net kernel: [ 3199.955625] usb 1-2.5: USB disconnect, device number 8
Feb 20 12:08:44 andyandy-net acpid: input device has been disconnected, fd 16
Feb 20 12:08:44 andyandy-net acpid: input device has been disconnected, fd 17
depois de enviar meu computador para dormir (para economizar energia), mais frequentemente do que ao acordar a tela é exibida (ou ao tentar desligá-lo depois que ele estiver no modo de suspensão). Algumas mensagens que podem ser úteis do syslog:
Feb 20 15:10:40 andyandy-net acpid: starting up with netlink and the input layer
Feb 20 15:10:40 andyandy-net acpid: 9 rules loaded
Feb 20 15:10:40 andyandy-net acpid: waiting for events: event logging is off
Feb 20 15:10:40 andyandy-net kernel: [ 5.153780] init: plymouth-upstart-bridge main process (1523) terminated with status 1
Feb 20 15:10:40 andyandy-net kernel: [ 5.153792] init: plymouth-upstart-bridge main process ended, respawning
Feb 20 15:10:40 andyandy-net acpid: client connected from 1541[0:0]
Feb 20 15:10:40 andyandy-net acpid: 1 client rule loaded
Feb 20 15:10:41 andyandy-net kernel: [ 5.280196] init: plymouth-stop pre-start process (1683) terminated with status 1
Eu só notei esse problema depois de conectar meu notebook ao meu dynadock para facilidade de uso.
Eu não entendo o que está causando o erro (o rastreamento não dá pistas para mim), então qualquer explicação e ajuda seria muito apreciada.